Use the HashSet of attribute names in SharedStyleFinder.

sky/engine/core/css/ElementRuleCollector.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 82 matching lines @@
 class ElementRuleCollector {
     STACK_ALLOCATED();
     WTF_MAKE_NONCOPYABLE(ElementRuleCollector);
 public:
     ElementRuleCollector(const ElementResolveContext&, RenderStyle* = 0);
     ~ElementRuleCollector();
 
     void setMode(SelectorChecker::Mode mode) { m_mode = mode; }
 
     void setMatchingUARules(bool matchingUARules) { m_matchingUARules = matchingUARules; }
-    bool hasAnyMatchingRules(RuleSet*);
 
     MatchResult& matchedResult();
 
     void collectMatchingRules(const MatchRequest&, RuleRange&, SelectorChecker::ContextFlags = SelectorChecker::DefaultBehavior, CascadeScope = ignoreCascadeScope, CascadeOrder = ignoreCascadeOrder);
     void sortAndTransferMatchedRules();
     void clearMatchedRules();
     void addElementStyleProperties(const StylePropertySet*, bool isCacheable = true);
 
 private:
     void collectRuleIfMatches(const RuleData&, SelectorChecker::ContextFlags, CascadeScope, CascadeOrder, const MatchRequest&, RuleRange&);
@@ skipping 22 matching lines @@
 
     OwnPtr<Vector<MatchedRule, 32> > m_matchedRules;
 
     // Output.
     MatchResult m_result;
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_CSS_ELEMENTRULECOLLECTOR_H_